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Q.
Is any other diagnosis code than P1272 output?
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Inspection chart for diagnosis codes (Refer to ).
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Q.
Is the check result normal?
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Replace the fuel filter then replace the common rail assembly and fuel injection
tubes.
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- After releasing the air from the fuel line, continue
idle operation for about five minutes and recheck for abnormal symptoms.
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Q.
Does trouble symptom persist?
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Replace the common rail assembly and common tubes.
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- Check suction control valve itself (Refer to ).
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Q.
Is the check result normal?
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Replace the supply pump assembly. After replacing the supply pump, learn the supply
pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail
Engine Learns ).
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Q.
Are the check results normal?
Go to Step 6 .
Repair or replace the connector then replace the common rail assembly and fuel
injection tubes.
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- Check output line for open/short circuit and damage.
Q.
Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire then replace the common rail assembly and common tubes.
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- Check output line for open/short circuit and damage.
Q.
Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire then replace the common rail assembly and fuel
injection tubes.
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- Engine: Idling
- Connect the oscilloscope special patterns pickup to engine-ECU terminal No. 37 and earth.
OK: The waveform should show a pattern similar to the illustration of Inspection procedure
using an oscilloscope (Refer to ).
Q.
Is the check result normal?
Go to Step 9 .
Replace the engine-ECU then replace the common rail assembly and fuel injection
tubes. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - How
to Perform Chassis Number Writing ). After replacing the engine-ECU,
register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions
Before Service - What The Common Rail Engine Learns ).
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- After replacing the common rail assembly and common tubes, re-check the trouble symptoms
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Q.
Does trouble symptom persist?
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Replace the supply pump assembly. After replacing the supply pump, learn the supply
pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail
Engine Learns ).
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